Midnight Nation by JMS and Gray Frank it's probably the best thing JMS has ever written in any media. I put in the same league as Watchmen.

Camelot 3000 by Mike Barr and Brian Bolland It's dated as hell but it's still an amusing read. King Arthur, Merlin, and the most well known Knights of the Round Table get reincarnated in the year 3000 to help save England and the world from alien invaders.